Newton's laws
1. Introduction
2. Force
3. Basic types of forces
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3. Newton's laws
4. Frictional forces
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5. Force and free-body diagrams
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6. Components and resultants of forces
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7. Newton's first law
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8. Newton's second law
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9. Equilibrium and non-equilibrium
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10. Systems and pulleys
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11. Newton's third law
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12. Forces between masses
13. Newton's universal law of gravitation
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14. Weight and mass
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15. Proportional reasoning with gravity
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